Added X-Mailer header to outgoing emails (#19562)

- It's a non-standard mentioned in https://www.ietf.org/rfc/rfc2076.html#section-3.4
- This header makes emails filtering easier

diff --git a/services/mailer/mail.go b/services/mailer/mail.go
index a5b60f71ec3113e73f96706e9c7299e3f7633e91..bdd7e25cabd4e108f3c51187e4ae25002a4ad5f6 100644 (file)
--- a/services/mailer/mail.go
+++ b/services/mailer/mail.go
@@ -367,6 +367,7 @@ func generateAdditionalHeaders(ctx *mailCommentContext, reason string, recipient
                //"List-Post": https://github.com/go-gitea/gitea/pull/13585
                "List-Unsubscribe": ctx.Issue.HTMLURL(),
 
+               "X-Mailer":                  "Gitea",
                "X-Gitea-Reason":            reason,
                "X-Gitea-Sender":            ctx.Doer.DisplayName(),
                "X-Gitea-Recipient":         recipient.DisplayName(),